pl here are some tips because i see a white halo around the lines. either u have put the color on the same lines layer (which i hope you didnt). hopefully if you havent, seems like u used the magic wand to select areas. when you do that make sure to expand the selection by about half the line width to remove teh white antialiasing of the line.
oh and as i tell everyone that is now learnin to toon or starting photoshop, learn to use the pen tool, it will be your best friend